Drilling head



FIG. 1 is a bottom, right side and rear perspective view of a drilling head showing our new design;

FIG. 2 is a top, left side and front perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a bottom perspective view thereof; and,

FIG. 7 is a top plan view thereof. 

The ornamental design for a drilling head, as shown. 